CA1095887A - Wedge arrangement - Google Patents
Wedge arrangementInfo
- Publication number
- CA1095887A CA1095887A CA288,450A CA288450A CA1095887A CA 1095887 A CA1095887 A CA 1095887A CA 288450 A CA288450 A CA 288450A CA 1095887 A CA1095887 A CA 1095887A
- Authority
- CA
- Canada
- Prior art keywords
- wedge
- members
- fingers
- head
- arrangement according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000037431 insertion Effects 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims 1
- 238000005086 pumping Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Clamps And Clips (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A wedge arrangement can comprise two members which can be moved relative to one another in their axial direction by means of a drive means thereby providing a wedging effect.
The wedge members are of substantially the same length and the respective outer wedge surfaces thereof are provided with gripping means directed rearwardly from respective points of said wedge members. The gripping means are arranged to grip respective surfaces of two mutually opposed surfaces which are to be separated by means of the wedge arrangement. A drive means is arranged to apply a driving force alternately to respective wedge members.
A wedge arrangement can comprise two members which can be moved relative to one another in their axial direction by means of a drive means thereby providing a wedging effect.
The wedge members are of substantially the same length and the respective outer wedge surfaces thereof are provided with gripping means directed rearwardly from respective points of said wedge members. The gripping means are arranged to grip respective surfaces of two mutually opposed surfaces which are to be separated by means of the wedge arrangement. A drive means is arranged to apply a driving force alternately to respective wedge members.
Description
lO9S8B~
The present invention relates to a wedge arrangement.
Wedges are generally used to widen the space between two adjacent and mutually opposing surfaces r for example to fell a tree subsequent to sawing partly through the trunk thereof.
Hitherto known wedges are one-piece structures which are intended to be driven into a saw cut made in the bowl of a tree, for example, or into the space between two adjacent but connected surfaces by means of a sledge hammer or like driving means. Although the intended effect is obtained in the majority of cases, i.e., the space between the two surfaces is widenedr with wedges having a very large wedge angle a great force is re-quired to drive the wedge into said space, and further if the direction in which the blow is aimed does not lie directly on the wedge, there is a risk that the wedge will be knocked to one side.
It is an object of the present invention to obviate or mitigate the above disadvantages.
An object of the invention is therefore to provide a wedge arrangement which does not require the use of a sledge ham-mer and which, even in the case of wide wedge angles, can be driven into a cleft with the least possible force and which will positively maintain its correct position between those surfaces to be separated.
According to the present invention there is provided a wedge arrangement comprising wedge members of substantially the same length which can be moved relative to one another in their axial direction to provide a wedging effect, and a drive means arranged to apply a driving force to respective wedge members, the wedge members at least comprising two outer fingers and an inter-mediate finger.
So that the invention will be more readily understood lOgS887 and further features thereof made apparent, two embodiments of the invention will now be described with reference to the accom-panying schematic drawings, in which:
Figure 1 is a partially sectioned view of an embodiment of a wedge arrangement according to the invention, seen in plan;
Figure 2 is a sectional view taken along the line II-II in Figure 3;
Figure 3 is a sectional view taken along the line III-III in Figure l; and, Figure 4 illustrates a modified arrangement.
Figures 1 to 3 illustrate a first embodiment of the wedge arrangement. The embodiment permits the wedge members to swing away from each other. An upper wedge member 31 has two - wedge fingers 33 and 34 projecting from a central wedge body 32 and the upper working surface of the wedge member 31 is p~ovided with rearwardly extending, edge-like teeth, for example, teeth 35 and 36. The end portion of the fingers 33 and 34 have an un-der abutment surface 37, which is preferably provided with rear-wardly extending teeth. The rear end of the wedge member 31 is provided with two lugs 38 and 39, respectively, which have lower bearing holes for fixedly receiving two mutually aligned, in-wardly turned bearing pins 40 and 41 respectively. In this case the lever 19 is fork-shaped having two arms 42 and 43. Each of the arms 42 and 43 has a hole 44 and 45 respectively. The peg 40 is loosely mounted in the hole 44, which has a larger ~iameter than the peg 40. The peg 41 is loosely mounted in the hole 45, which also has a larger diameter than the peg 41.
The lower wedge member 32 is a mirror image of the wedge member 31 and thus has a rear wedge body from which extend two wedge fingers 46 and 47~ The two fingers 46 and 47 are freely lO9S~87 pivotable in the spaces between the fingers of the upper wedge member 31, On its outwardly turned surface, the wedge member 32 is provided with rearwardly extending teeth or other gripping means comparable therewith, such as the teeth 48 and 49 and the inner surface of the point portion of said wedge member forms an abutment surface 50 which is preferably provided with rearwardly extending teeth.
The outer end portion of the wedge member 32 has a cen-tral lug 51 having a through passing peg 52 projecting outwardly on both sides of said lug. The two free ends of the peg 52 are freely mounted in upper holes 53 and 54 in respective arms 41, 43 of the fork lever 19.
As will be seen from Figure 3, the points of the wedge members are relatively thin so that the wedge arrangement can be inserted into a relatively narrow slot or the like between two surfaces 24, 25 to be separated by means of said wedge arrangement, and the size of the teeth can increase from the point of respect--ive wedge members towards the end portions thereof if desired.
The central bodies of the two wedge members 31, 32 have planar mutually conforming surfaces 55 and 56 respectively, which enable the wedge members to be placed together so that the surface 50 lies against the surface 24 and the surface 37 lies against the surface 25 to form a guide into the space for the wedge arrange-ment. To maintain the two wedge mer~ers in a normal position with the points on the wedge fingers lying in a common plane, there may be provided a resilient element, for example a rubber ball 57, in a groove 58 in the lower wedge member 32. This rubber ball presses against the under surface of the wedge member 31. For the purpose of guiding the wedge members 31 and 32 relative to one another there is provided a bolt 59 which is screwed into the 10g588'7 lower wedge member 32 and the head of which is slidably arranged in a groove 60 in the upper wedge member 31.
When using the described wedge arrangement, the two wedge members 31 and 32 are inserted into the gap formed between the bodies or surfaces 24, 25 to be separated from each other, with the handle 19 occupying the position shown in Figure 3.
When the lever 19 of the embodiment according to Figures 1, 2 and 3 is moved downwardly subsequent to bringing the wedge members firmly between the surfaces 24 and 25, the lower wedge member 32 will be firmly locked by its rearwardly extend-ing teeth and the shaft 52 will form a fixed pivot point for the forked arms 42, 43 of said lever. As the lever 19 is moved down-wardly, the pegs 40 and 41 will urge the upper wedge member 31 forwardly and at the same time swing the pointed surface 37 of the wedge member into abutment with the surface 25. When the lever is subsequently moved upwards, the upper wedge member 31 will be prevented from sliding upwardly and the pegs 40, 41 form a fixed axis of rotation. The shaft 52 thus forms a means for inserting the lower wedge member 32 further into the gap, this wedge member being swung upwardly during its inward movement until the abutment surface 50 engages the surface 24~ This sequence of operation is repeated until the wedge arrangement has been "pumped" far enough in between the surfaces 24 and 25 for the surfaces to be separated to the intended amount.
As will be readily understood, the manually operated handle by means of which the aforedescribed alternate insertion movement of the two wedge members is achieved, can be replaced by a drive means comprising two hydraulic or pneumatic pistons which will move the wedge members alternately into the space between the surfaces to be separated, or by pistons that are operated with i~9s887 other means than air or hydraulic fluid.
The aforedescribed wedge arrangement is operated by means of a head. When the head is pivoted by means of, for ex-ample, a lever, the wedge members are only lifted a small dis-tance apart. In many cases, it has been found that the wedge mem-bers must be lifted further apart in order, for example, a tree to be felled satisfactorily.
Figure 4 illustrates a modified embodiment of the wedge arrangement in which the connection between the head and the two wedge members is such that in addition to permitting the wedge members to be driven in to a cleft between two surfaces to be separated enables the separation of said surfaces to be effected by means of the head, whereupon a tree can be felled more readily.
The modified embodiment shown in Figure 4 comprises an upper wedge member 61 which comprises two parts and which is pro-vided with teeth 62 arranged to grip one of the two surfaces to be separated, and a lower wedge member 63 having teeth 64 engaged to grip the other surface to be separated. The two surfaces to be separated from each other are not shown but, as will be under-stood, may be the opposing surfaces of a sawcut made in the trunkof a tree. The wedge member 61 is pivotally mounted on a head 65 by means of a shaft 66, and the wedge member 63 is pivotally mounted on a shaft 67 which extends through two lugs on the head 65, of which lugs only one, 68, is shown. The head 65 is pro-vided with a lever 69.
The wedge members 61 and 63 are shown in a lifted posi-tion, i.e., the end portions of respective wedge members have been lifted away from each other. The rear portions of the wedge members can be further parted by further rotating the head 65 an-ticlockwise until its shafts 66 and 67 lie on one line with each ,", ~ ~f~, ~O9S887 other, this line being substantially vertical. In this latter case, the lever 69 is brought to a position in which it is in-clined more anticlockwise than its illustrated position in the figure. The angle which is generated by rotating the head 65 to the illustrated position is, however, sufficient to fell a tree into which the wedge arrangement has been driven. Whilst the wedge members are being driven alternately into said cleft by pumping the lever 69, the lever lies obliquely downwardly, the shaft 67 being located approximately in the position shown at 67'. Whilst pumping the handle, the shaft 67 is moved from the position 67' alternatively with the shaft 66 in the direction of arrows A and B respectively.
As soon as the wedge members have been driven into the intended depth in the sawcut and are well locked therein, the handle 69 is swung counterclockwise to the position shown in the figure, whereupon the wedge members 61 and 63, which were in close abutment with each other whilst being driven in to said cleft are moved to the position shown in the figure, i.e., the wedge angle is greatly increased to exert an additional wedge force causing the tree to fall.
It is essential that the pivot connections 66, 67 are so arranged on the head 65 that said head can adopt a first posi-tion with the wedge members close to each other to enable them to be driven into said cleft, and a second position in which the wedge members are moved apart to greatly increase the wedge angle.
The fork~like wedge member 61 may be divided into two separate wedgQ sections on either side of the central wedge mem-ber 63 and each such separate wedge section is journalled on a lug 68 by means of a shaft 66. It is also possible to change the bearing points so that the central wedge member 63 is journalled ~ 6 ~
-109~7 ,, in the head 65 on the shaft 66 and the further wedge mem~ers or member, for example, the wedge section 61~ is journalled on the shaft 67.
In order for the teeth to penetrate into the surfaces 24 and 25 to the requisite extent, the teeth must be harder than the material of said surfaces.
The present invention relates to a wedge arrangement.
Wedges are generally used to widen the space between two adjacent and mutually opposing surfaces r for example to fell a tree subsequent to sawing partly through the trunk thereof.
Hitherto known wedges are one-piece structures which are intended to be driven into a saw cut made in the bowl of a tree, for example, or into the space between two adjacent but connected surfaces by means of a sledge hammer or like driving means. Although the intended effect is obtained in the majority of cases, i.e., the space between the two surfaces is widenedr with wedges having a very large wedge angle a great force is re-quired to drive the wedge into said space, and further if the direction in which the blow is aimed does not lie directly on the wedge, there is a risk that the wedge will be knocked to one side.
It is an object of the present invention to obviate or mitigate the above disadvantages.
An object of the invention is therefore to provide a wedge arrangement which does not require the use of a sledge ham-mer and which, even in the case of wide wedge angles, can be driven into a cleft with the least possible force and which will positively maintain its correct position between those surfaces to be separated.
According to the present invention there is provided a wedge arrangement comprising wedge members of substantially the same length which can be moved relative to one another in their axial direction to provide a wedging effect, and a drive means arranged to apply a driving force to respective wedge members, the wedge members at least comprising two outer fingers and an inter-mediate finger.
So that the invention will be more readily understood lOgS887 and further features thereof made apparent, two embodiments of the invention will now be described with reference to the accom-panying schematic drawings, in which:
Figure 1 is a partially sectioned view of an embodiment of a wedge arrangement according to the invention, seen in plan;
Figure 2 is a sectional view taken along the line II-II in Figure 3;
Figure 3 is a sectional view taken along the line III-III in Figure l; and, Figure 4 illustrates a modified arrangement.
Figures 1 to 3 illustrate a first embodiment of the wedge arrangement. The embodiment permits the wedge members to swing away from each other. An upper wedge member 31 has two - wedge fingers 33 and 34 projecting from a central wedge body 32 and the upper working surface of the wedge member 31 is p~ovided with rearwardly extending, edge-like teeth, for example, teeth 35 and 36. The end portion of the fingers 33 and 34 have an un-der abutment surface 37, which is preferably provided with rear-wardly extending teeth. The rear end of the wedge member 31 is provided with two lugs 38 and 39, respectively, which have lower bearing holes for fixedly receiving two mutually aligned, in-wardly turned bearing pins 40 and 41 respectively. In this case the lever 19 is fork-shaped having two arms 42 and 43. Each of the arms 42 and 43 has a hole 44 and 45 respectively. The peg 40 is loosely mounted in the hole 44, which has a larger ~iameter than the peg 40. The peg 41 is loosely mounted in the hole 45, which also has a larger diameter than the peg 41.
The lower wedge member 32 is a mirror image of the wedge member 31 and thus has a rear wedge body from which extend two wedge fingers 46 and 47~ The two fingers 46 and 47 are freely lO9S~87 pivotable in the spaces between the fingers of the upper wedge member 31, On its outwardly turned surface, the wedge member 32 is provided with rearwardly extending teeth or other gripping means comparable therewith, such as the teeth 48 and 49 and the inner surface of the point portion of said wedge member forms an abutment surface 50 which is preferably provided with rearwardly extending teeth.
The outer end portion of the wedge member 32 has a cen-tral lug 51 having a through passing peg 52 projecting outwardly on both sides of said lug. The two free ends of the peg 52 are freely mounted in upper holes 53 and 54 in respective arms 41, 43 of the fork lever 19.
As will be seen from Figure 3, the points of the wedge members are relatively thin so that the wedge arrangement can be inserted into a relatively narrow slot or the like between two surfaces 24, 25 to be separated by means of said wedge arrangement, and the size of the teeth can increase from the point of respect--ive wedge members towards the end portions thereof if desired.
The central bodies of the two wedge members 31, 32 have planar mutually conforming surfaces 55 and 56 respectively, which enable the wedge members to be placed together so that the surface 50 lies against the surface 24 and the surface 37 lies against the surface 25 to form a guide into the space for the wedge arrange-ment. To maintain the two wedge mer~ers in a normal position with the points on the wedge fingers lying in a common plane, there may be provided a resilient element, for example a rubber ball 57, in a groove 58 in the lower wedge member 32. This rubber ball presses against the under surface of the wedge member 31. For the purpose of guiding the wedge members 31 and 32 relative to one another there is provided a bolt 59 which is screwed into the 10g588'7 lower wedge member 32 and the head of which is slidably arranged in a groove 60 in the upper wedge member 31.
When using the described wedge arrangement, the two wedge members 31 and 32 are inserted into the gap formed between the bodies or surfaces 24, 25 to be separated from each other, with the handle 19 occupying the position shown in Figure 3.
When the lever 19 of the embodiment according to Figures 1, 2 and 3 is moved downwardly subsequent to bringing the wedge members firmly between the surfaces 24 and 25, the lower wedge member 32 will be firmly locked by its rearwardly extend-ing teeth and the shaft 52 will form a fixed pivot point for the forked arms 42, 43 of said lever. As the lever 19 is moved down-wardly, the pegs 40 and 41 will urge the upper wedge member 31 forwardly and at the same time swing the pointed surface 37 of the wedge member into abutment with the surface 25. When the lever is subsequently moved upwards, the upper wedge member 31 will be prevented from sliding upwardly and the pegs 40, 41 form a fixed axis of rotation. The shaft 52 thus forms a means for inserting the lower wedge member 32 further into the gap, this wedge member being swung upwardly during its inward movement until the abutment surface 50 engages the surface 24~ This sequence of operation is repeated until the wedge arrangement has been "pumped" far enough in between the surfaces 24 and 25 for the surfaces to be separated to the intended amount.
As will be readily understood, the manually operated handle by means of which the aforedescribed alternate insertion movement of the two wedge members is achieved, can be replaced by a drive means comprising two hydraulic or pneumatic pistons which will move the wedge members alternately into the space between the surfaces to be separated, or by pistons that are operated with i~9s887 other means than air or hydraulic fluid.
The aforedescribed wedge arrangement is operated by means of a head. When the head is pivoted by means of, for ex-ample, a lever, the wedge members are only lifted a small dis-tance apart. In many cases, it has been found that the wedge mem-bers must be lifted further apart in order, for example, a tree to be felled satisfactorily.
Figure 4 illustrates a modified embodiment of the wedge arrangement in which the connection between the head and the two wedge members is such that in addition to permitting the wedge members to be driven in to a cleft between two surfaces to be separated enables the separation of said surfaces to be effected by means of the head, whereupon a tree can be felled more readily.
The modified embodiment shown in Figure 4 comprises an upper wedge member 61 which comprises two parts and which is pro-vided with teeth 62 arranged to grip one of the two surfaces to be separated, and a lower wedge member 63 having teeth 64 engaged to grip the other surface to be separated. The two surfaces to be separated from each other are not shown but, as will be under-stood, may be the opposing surfaces of a sawcut made in the trunkof a tree. The wedge member 61 is pivotally mounted on a head 65 by means of a shaft 66, and the wedge member 63 is pivotally mounted on a shaft 67 which extends through two lugs on the head 65, of which lugs only one, 68, is shown. The head 65 is pro-vided with a lever 69.
The wedge members 61 and 63 are shown in a lifted posi-tion, i.e., the end portions of respective wedge members have been lifted away from each other. The rear portions of the wedge members can be further parted by further rotating the head 65 an-ticlockwise until its shafts 66 and 67 lie on one line with each ,", ~ ~f~, ~O9S887 other, this line being substantially vertical. In this latter case, the lever 69 is brought to a position in which it is in-clined more anticlockwise than its illustrated position in the figure. The angle which is generated by rotating the head 65 to the illustrated position is, however, sufficient to fell a tree into which the wedge arrangement has been driven. Whilst the wedge members are being driven alternately into said cleft by pumping the lever 69, the lever lies obliquely downwardly, the shaft 67 being located approximately in the position shown at 67'. Whilst pumping the handle, the shaft 67 is moved from the position 67' alternatively with the shaft 66 in the direction of arrows A and B respectively.
As soon as the wedge members have been driven into the intended depth in the sawcut and are well locked therein, the handle 69 is swung counterclockwise to the position shown in the figure, whereupon the wedge members 61 and 63, which were in close abutment with each other whilst being driven in to said cleft are moved to the position shown in the figure, i.e., the wedge angle is greatly increased to exert an additional wedge force causing the tree to fall.
It is essential that the pivot connections 66, 67 are so arranged on the head 65 that said head can adopt a first posi-tion with the wedge members close to each other to enable them to be driven into said cleft, and a second position in which the wedge members are moved apart to greatly increase the wedge angle.
The fork~like wedge member 61 may be divided into two separate wedgQ sections on either side of the central wedge mem-ber 63 and each such separate wedge section is journalled on a lug 68 by means of a shaft 66. It is also possible to change the bearing points so that the central wedge member 63 is journalled ~ 6 ~
-109~7 ,, in the head 65 on the shaft 66 and the further wedge mem~ers or member, for example, the wedge section 61~ is journalled on the shaft 67.
In order for the teeth to penetrate into the surfaces 24 and 25 to the requisite extent, the teeth must be harder than the material of said surfaces.
Claims (16)
1. A wedge arrangement comprising two wedge members of substantially the same length which can be moved relative to one another in their axial direction to provide a wedging effect, the respective outer wedge surfaces of which are provided with gripping means directed rearwardly from respective points of said wedge members, said gripping means being arranged to grip respective surfaces of two mutually opposing surfaces which are to be separated by means of said wedge arrangement, and a drive means arranged to apply a driving force alternately to respect-ive wedge members, wherein each wedge member has arranged on the end thereof adjacent the point of said wedge member mutually se-parated fingers so that the fingers on one wedge member lie in the spaces between the fingers on the other wedge member; the wedge members being able to be swung to a position in which said fingers cross each other.
2. A wedge arrangement according to claim 1, wherein guide means are arranged between said wedge members and are ope-rative to guide the wedge members relative to one another in their axial direction.
3. A wedge arrangement according to claim 1, wherein the mutually opposing surfaces of said wedge members are slide surfaces.
4. A wedge arrangement according to any one of claims 1 to 3, wherein the drive means for said wedge members comprises a lever having a head which is connected to respective wedge mem-bers via a pivotable connection.
5. A wedge arrangement according to any one of claims 1 to 3, wherein the drive means comprises two pistons or the like driven from a power source and arranged to act alternately on the two wedge members.
6. A wedge arrangement according to claim 1, wherein arranged between the two wedge members is a resilient means such that the wedge points of said wedge members can be arranged in substantially the same plane in order to facilitate insertion of said wedge arrangement into a space where the wedge arrangement is to be used.
7. A wedge arrangement according to claim 1 or 6, wherein arranged on the inner surface of each wedge member on a portion adjacent the point thereof are rearwardly extending gripping means.
8. A wedge arrangement according to claim 1, wherein end portions of the wedge members are mounted on a head which is arranged to be rotated between a first position, in which the two wedge members lie closest together and a second position in which the end portions of the wedge members adjacent said head are moved away from each other.
9. A wedge arrangement comprising wedge members of substantially the same length which can be moved relative to one another in their axial direction to provide a wedging effect, and a drive means arranged to apply a driving force to respective wedge members, the wedge members at least comprising two outer fingers and an intermediate finger.
10. A wedge arrangement according to claim 9, wherein the drive means comprises a lever having a head which is pivot-ally connected to the wedge fingers.
11. A wedge arrangement according to claim 10, where-in the fingers are individually journalled on the head.
12. A wedge arrangement according to claim 9, wherein the drive means includes a head which is pivotally connected to the wedge fingers and wherein the head is arranged to be rotated between a first position, in which the three fingers lie closest together and a second position in which the end portion of the intermediate finger adjacent said head is moved away from the corresponding end portions of the two outer fingers.
13. A wedge arrangement according to claim 12, where-in said head has two lugs and wherein each outer finger is jour-nalled on a shaft on a respective lug on the head, which shafts are positioned on the same height level, while the intermediate finger is journalled on a shaft positioned under the two sepa-rate shafts when the head is in the first position.
14. A wedge arrangement according to claim 9, wherein the outer surfaces of each finger are provided with gripping means directed rearwardly from the respective points of the fingers.
15. A wedge arrangement according to claim 9 or 14 wherein there are two wedge members, one of said members forming said two outer fingers and the other of said members forming said intermediate finger and wherein said drive means in use alter-nately applies a driving force to each of said wedge members.
16. A wedge arrangement for forceably spreading apart the opposing surfaces of a saw cut made in a tree, comprising:
(a) a first pointed wedge member having at least two spaced, parallel fingers, (b) a second pointed wedge member having at least one finger disposed in the space between said two fingers of the first wedge member, the second wedge member having substantially the same length as the first wedge member, (c) wood gripping means on the outer surface of each wedge member directed rearwardly from the respective points thereof for engaging the opposing surfaces of a saw cut in a tree, and (d) drive means coupled to the first and second wedge members for alternately applying an axial force to each of said members to successively advance the wedge arrangement into the saw cut in a step-by-step manner.
(a) a first pointed wedge member having at least two spaced, parallel fingers, (b) a second pointed wedge member having at least one finger disposed in the space between said two fingers of the first wedge member, the second wedge member having substantially the same length as the first wedge member, (c) wood gripping means on the outer surface of each wedge member directed rearwardly from the respective points thereof for engaging the opposing surfaces of a saw cut in a tree, and (d) drive means coupled to the first and second wedge members for alternately applying an axial force to each of said members to successively advance the wedge arrangement into the saw cut in a step-by-step manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA288,450A CA1095887A (en) | 1977-10-11 | 1977-10-11 | Wedge arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA288,450A CA1095887A (en) | 1977-10-11 | 1977-10-11 | Wedge arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1095887A true CA1095887A (en) | 1981-02-17 |
Family
ID=4109732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA288,450A Expired CA1095887A (en) | 1977-10-11 | 1977-10-11 | Wedge arrangement |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1095887A (en) |
-
1977
- 1977-10-11 CA CA288,450A patent/CA1095887A/en not_active Expired
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |